/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.util.condition;

import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.engine.DynamicBpmnConstants;
import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.impl.Condition;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.el.UelExpressionCondition;
import org.apache.commons.lang3.StringUtils;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 */
public class ConditionUtil {

	public static boolean hasTrueCondition(SequenceFlow sequenceFlow, DelegateExecution execution) {
		String conditionExpression = null;
		if (Context.getProcessEngineConfiguration().isEnableProcessDefinitionInfoCache()) {
			ObjectNode elementProperties = Context.getBpmnOverrideElementProperties(sequenceFlow.getId(), execution.getProcessDefinitionId());
			conditionExpression = getActiveValue(sequenceFlow.getConditionExpression(), DynamicBpmnConstants.SEQUENCE_FLOW_CONDITION, elementProperties);
		} else {
			conditionExpression = sequenceFlow.getConditionExpression();
		}

		if (StringUtils.isNotEmpty(conditionExpression)) {
			Expression expression = Context.getProcessEngineConfiguration().getExpressionManager().createExpression(conditionExpression);
			Condition condition = new UelExpressionCondition(expression);
			if (condition.evaluate(sequenceFlow.getId(), execution)) {
				return true;
			}

			return false;

		} else {
			return true;
		}
	}

	protected static String getActiveValue(String originalValue, String propertyName, ObjectNode elementProperties) {
		String activeValue = originalValue;
		if (elementProperties != null) {
			JsonNode overrideValueNode = elementProperties.get(propertyName);
			if (overrideValueNode != null) {
				if (overrideValueNode.isNull()) {
					activeValue = null;
				} else {
					activeValue = overrideValueNode.asText();
				}
			}
		}
		return activeValue;
	}

}
